I started with VT1-445 and stock us headers Eng Torque was 280(Ft-Lbs) Eng Power 360 HP on a Mustang Dynamometer.
Just upgraded two a VT2-500 and Euro header .
I can feel the difference in the way the car puts me back in my seat the lack in traction in 2nd and 3rd gear
Still tweeking then out to put it on the dyno.